/*
 * Copyright 2020-2099 sa-token.cc
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package cn.dev33.satoken.servlet.model;

import cn.dev33.satoken.SaManager;
import cn.dev33.satoken.application.ApplicationInfo;
import cn.dev33.satoken.context.model.SaRequest;
import cn.dev33.satoken.exception.SaTokenException;
import cn.dev33.satoken.servlet.error.SaServletErrorCode;
import cn.dev33.satoken.util.SaFoxUtil;

import javax.servlet.ServletException;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.*;

/**
 * 对 SaRequest 包装类的实现（Servlet 版）
 *
 * @author click33
 * @since 1.19.0
 */
public class SaRequestForServlet implements SaRequest {

	/**
	 * 底层Request对象
	 */
	protected HttpServletRequest request;

	/**
	 * 实例化
	 * @param request request对象
	 */
	public SaRequestForServlet(HttpServletRequest request) {
		this.request = request;
	}

	/**
	 * 获取底层源对象 
	 */
	@Override
	public Object getSource() {
		return request;
	}

	/**
	 * 在 [请求体] 里获取一个值 
	 */
	@Override
	public String getParam(String name) {
		return request.getParameter(name);
	}

	/**
	 * 获取 [请求体] 里提交的所有参数名称
	 * @return 参数名称列表
	 */
	@Override
	public List<String> getParamNames(){
		Enumeration<String> parameterNames = request.getParameterNames();
		List<String> list = new ArrayList<>();
		while (parameterNames.hasMoreElements()) {
			list.add(parameterNames.nextElement());
		}
		return list;
	}

	/**
	 * 获取 [请求体] 里提交的所有参数
	 * @return 参数列表
	 */
	@Override
	public Map<String, String> getParamMap(){
		// 获取所有参数
		Map<String, String[]> parameterMap = request.getParameterMap();
		Map<String, String> map = new LinkedHashMap<>(parameterMap.size());
		for (String key : parameterMap.keySet()) {
			String[] values = parameterMap.get(key);
			map.put(key, values[0]);
		}
		return map;
	}

	/**
	 * 在 [请求头] 里获取一个值 
	 */
	@Override
	public String getHeader(String name) {
		return request.getHeader(name);
	}

	/**
	 * 在 [Cookie作用域] 里获取一个值 
	 */
	@Override
	public String getCookieValue(String name) {
		return getCookieLastValue(name);
	}

	/**
	 * 在 [ Cookie作用域 ] 里获取一个值 (第一个此名称的)
	 */
	@Override
	public String getCookieFirstValue(String name){
		Cookie[] cookies = request.getCookies();
		if (cookies != null) {
			for (Cookie cookie : cookies) {
				if (cookie != null && name.equals(cookie.getName())) {
					return cookie.getValue();
				}
			}
		}
		return null;
	}

	/**
	 * 在 [ Cookie作用域 ] 里获取一个值 (最后一个此名称的)
	 * @param name 键
	 * @return 值
	 */
	@Override
	public String getCookieLastValue(String name){
		String value = null;
		Cookie[] cookies = request.getCookies();
		if (cookies != null) {
			for (Cookie cookie : cookies) {
				if (cookie != null && name.equals(cookie.getName())) {
					value = cookie.getValue();
				}
			}
		}
		return value;
	}

	/**
	 * 返回当前请求path (不包括上下文名称) 
	 */
	@Override
	public String getRequestPath() {
		return ApplicationInfo.cutPathPrefix(request.getRequestURI());
	}

	/**
	 * 返回当前请求的url，例：http://xxx.com/test
	 * @return see note
	 */
	public String getUrl() {
		String currDomain = SaManager.getConfig().getCurrDomain();
		if( ! SaFoxUtil.isEmpty(currDomain)) {
			return currDomain + this.getRequestPath();
		}
		return request.getRequestURL().toString();
	}
	
	/**
	 * 返回当前请求的类型 
	 */
	@Override
	public String getMethod() {
		return request.getMethod();
	}

	/**
	 * 转发请求 
	 */
	@Override
	public Object forward(String path) {
		try {
			HttpServletResponse response = (HttpServletResponse)SaManager.getSaTokenContextOrSecond().getResponse().getSource();
			request.getRequestDispatcher(path).forward(request, response);
			return null;
		} catch (ServletException | IOException e) {
			throw new SaTokenException(e).setCode(SaServletErrorCode.CODE_20001);
		}
	}
	
}
